An official iOS update fixes Error 53 bricked devices, but won't re-enable Touch ID
this was designed to be a factory test and was not intended to affect customersToday, Apple has finally addressed the issue with an update to iOS 9.2.1. The new update will fix the problem for users who have updated their iPhone via iTunes, and encountered the dreadful 'Error 53' message (it's worth noting that those who updated their phones over the air should have never seen that error in the first place).
Today, Apple released a software update that allows customers who have encountered this error message to successfully restore their device using iTunes on a Mac or PC.
We apologize for any inconvenience, this was designed to be a factory test and was not intended to affect customers. Customers who paid for an out-of-warranty replacement of their device based on this issue should contact AppleCare about a reimbursement.